ohlenbusch



Aug; 25, 1925' J. M. OHLENBUSCH ELECTRIC HEATER FOR HAIR WAVING FiledApril 4. 1 924 ATTOR V v I WITNESSES Patented Aug. 25, 1925.

UNITED STATES F ICE.

PATENT OF JOHN M. OHLENBUSGH, OF NEW YORK, N. Y.

Application filed. April 4,

To all whom it may concern:

Be it known that I, JOHN M. OHLEN- BUSGH, a citizen of the UnitedStates, and a resident of the city, county, and State of New York, haveinvented certain new and useful Improvements in Electric Heaters forHair Waving, of which the following is a specification.

In hair waving apparatus now generally in use for efiecting so-calledpermanent waves in the hair while on the human head, a plurality ofelectric heaters for the hair are employed, sometimes as many as forty,each of which is independently supported by a cord carrying a counterweight or balance for the heater at the other end. The heaters arehollow or tubular, and each is adapted to receive in its bore a portionof the hair which has been tightly wound on a core or curler andsuitably covered.

The present invention relates to electric heaters of the type justdescribed. One object is to provide a heater, which will be neat inappearance, simple and inexpensive to manufacture, and which will at thesame time be thoroughly durable. Another object is to provide a heaterso formed and arranged as to reduce to a minimum the transfer of heatfrom the tubular heating portion to the handle of the device. Other andfurther objects and features of the invention will appear hereinafter inthe specification and will be more particularly pointed out in theannexed claims.

The invention will now be described, by way of example, with referenceto the accompanying drawings, in which two embodiments thereof areillustrated, and in which like reference numerals in the several figuresdesignate like parts.

In said drawings Fig. 1 is a perspective view showing a completeelectrical heater according to the invention;

Fig. 2 is a central longitudinal section through the device;

Fig. 3 is a sectional view through the shank and the shank engagingportion of the handle, taken along the line 33 of Fig. 2;

Fig. 4 is a view partly in section and partly in elevation, taken alongthe line 4c-t of Fig. 3;

Fig. 5 is a section taken along line 55 of Fig. 3;

Fig. 6 is a section, corresponding to the ELECTRIC HEATER FOR HAIRWAVING.

1924. Serial No. 704,161.

view in Fig. 3, illustrating a modification in dwhich the shank is madein two parts; an

Fig. 7 is a view, similar to that of Fig. 4, of the modification of Fig.6.

Referring more specifically to the drawings, the heater may be said tobe composed of three principal parts, namely the shank 10, the handle11, and the tubular heating portion 12.

The shank 10 is preferably made of a heat insulating material, and forthis purpose I have found asbestos highly satisfactory, not only becauseit is heat insulating, but also because it is an electrical insulator,and because it can be moulded into the form required.

In the embodiment of the invention illustrated in Figs. 1 to 5inclusive, the shank 10 is shown as formed of a single piece of mouldedasbestos, and provided with the lateral extension 13 at one end whichwill be referred to as the outer end. A passage 14: (Fig. 3) passesthrough the center of the main body of the shank and leads into anoblong recess 15 provided in the face of the shank at the outer end. Twoother passages or circular recesses 16 and 17 run part way through theshank, parallel with the passage 1 1. These passages or recesses 16 and17 continue on to the recess 15 through smaller communicating holes orpassage-s which are just large enough to accommodate the shanks of screwbolts 18 and 19, but are not large enough for the heads of these screwbolts to pass through. The heads therefore abut against the bottoms ofthe recesses or passages 16 and 17 as shown.

The screw bolts 18 and 19 serve as terminals for the electric lead inwires 20 and 21 and also for the ends 22 and 23 of the electric heatingwire which extend from within the tubular heating portion 12. Just howthe ends of this electric heating wire are lead in to the terminals 18and 19 will be described later. 20 and 21 are brought in through thepassage 14, and are then secured in the usual way to the terminals 18and 19 by screwing down the nuts 18 and 19 The recess 15 provided in theface of the outer end of the shank adjacent the tubular heating portion12, is preferably of sufficient size to fully accommodate the lead inwires and the terminals 18 and 19, so that they will not project beyondthe line of the outer face The electric lead in wires of the shank.After the electrical connections are made the flat plate or cover 24 isplaced over the outer face of the shank, and is secured thereto by meansof a screw 25. The plate is also held in position by the engagement ofthe ends of the legs of the U-shaped handle 11 therewith at each side,and by the conformity of its lower edge to the contour of the tubularheating port-ion 12. It may be found desirable to groove the undersurface of the plate 24 somewhat, between the recess 15 and the tubularheating portion 12, so that the plate as a whole will lie fiat againstthe face of the shank but will at the same time allow space for the endsof the heating wire running from the tubular heating portion to theterminals in the recess.

The U-shaped handle 11 is preferably made of metal having a certainamount of spring to it, so that the legs thereof may be sprung intoposition along the sides of the shank 10. The inside surfaces of theends of the legs are corrugated as shown, so that the shank is engagedonly by the ridges 26 of said corrugated surface. The purpose of thisconstruction is not only to secure a good grip on the surface of theshank 10, but more particularly to prevent as far as possible theconduction of heat from the shank to the handle. Although asbestos is agood heat insulator, the heating portion 12 is kept at such a hightemperature for such a length of time that as a rule a certain amount ofheat does pass into the shank 10. It is therefore desirable to reduce asmuch as possible the transfer of this heat into the handle 11, and it isfor this purpose that the shank engaging surfaces of the handle arecorrugated. The handle 11 is further secured to the shank 10 by means ofthe screws 27. The holes 26' through the shank are air holes to assistin cooling the shank and to reduce heat conduction therethrough.

The tubular heating portion is formed of the two concentrically arrangedmetal tubes 29 and 30, together with two layers 81 and 32 of coiledelectric heating wire interposed between the two tubes and insulatedtherefrom by layers of mica or other suitable insulating material 33,34, and 35. In constructing the device a layer 33 of insulating materialis placed around the inner tube 29. Then a single wire of suitablelength and electric re sistance is wound or coiled around said tube froma point near the inner end outward to form coiled layer 31. After thewire has been coiled out to a point adjacent the end, a layer 34 ofinsulating material is placed around the tube over the coiled layer 81,and the wire is then coiled back over insulating this layer 34. Aninsulating layer 35 is then placed over the coiled layer 32. After thishas been done the outer tube 30 is placed over the whole. The outertube, as shown,

is shorter than the inner tube by an amount substantially equal to thethickness of the lateral extension 18, and the outer ends of the tubesare brought substantially into alinement, so that the inner end of tube30 is short of the inner end of tube 29 by the difference in theirlengths. The inner end of tube 29 is passed through the apertureprovided therefor in the lateral extension 13, and is then expanded orflared outward at its end as indicated at 86 to seat it snugly in theaperture and so that it cannot pass through the aperture in an outward(left hand) direction. Before being placed over the inner tube 29, theouter tube 30 is flared slightly as indicated at 37, and is cut away toa slight extent at 38 so as to permit the ends 22 and 23 of the heatingwire to be led therefrom between the tube and lateral extension 13.After inner tube 29 has been seated, the outer end thereof is expandedor flared outwardly as indicated at 39 so as to engage the outer end oftube to close off the space between tubes 29 and 30 and to hold theinner end of tube 30 flush against extension 13. By this construction,it will be noted that the tubular heating portion is firmly secured tothe lateral extension of the shank in a very simple manner, and that theouter edge of the two tubes, or in other words the outer edge of thetubular heating portion, is closed off, so that the heating coil is notexposed.

As the two ends 22 and 23 of the heating coil or wire emerge from thetubular heating portion (see Fig. 1) they run laterally along the faceof the shank and extension until they reach the edge of the recess 15when they drop down and are secured to the terminals 18 and 19. Insecuring the ends to the terminals it is a good plan to twist themaround the lead in wires 20 and 21. In order to prevent the two lines ofwire as they extend along the face of the shank and its extension, fromcoming into contact with each other, a piece of mica 4:0 is slit andplaced over the wires, as shown, so that it lies over most of oneexposed line and extends under the other exposed line.

In the modification of the invention shown in Figs. 6 and 7. the shankand its lateral extension are formed in two pieces. The one piece 1Oincludes the extension, and is of practically uniform thicknessthroughout. In this construction of the device the two lead in wires areconnected to the terminals at a point between the two parts of theshank. The terminal bolts, however, pass through the two parts of theshank, and thus not only serve as terminals, but also serve as bolts forbinding the two parts of the shank together. The shank part 10 isprovided with two small passages 41 and42 through which the two ends ofthe heating wire pass in order to reach the terminals.

In this particular modification of the inven tion, the outer face of theshank is not recessed as in the case of the modification shown in Figs.1 to 5 inclusive, although two circular recesses are provided there forthe nuts on and the ends of the two terminal bolts. A recess 4L3 isprovided, however, on the inner part to accommodate the lead in wiresand the heating wire.

While I have described in detail the construction of two embodiments ofmy invention, it will be understood of course, that minor modificationsof the construction shown may be made without departing from the spiritof my invention.

I claim 1. In an electric heater for hair waving, a tubular heatingportion, an asbestos shank carrying said portion, and a handle securedto said shank.

2. In an electric heater for hair waving, a tubular heating portion, amoulded asbestos shank carrying said portion, and a handle secured tosaid shank.

3. In an electric heater for hair waving, a tubular heating portion, aheat insulating shank carrying said portion,and a U-shaped handle havingits legs secured to the sides of said shank.

4. In an electric heater for hair waving, a tubular heating portion, aheat insulating shank carrying said portion, and a handle provided withcorrugated surfaces and engaging and secured to said shank only alongthe teeth of said corrugated surface.

5. In an electric heater for hair waving, a tubular heating portion, aheat insulating shank carrying said portion, and a U-shaped handlehaving corrugations upon its inside surface adjacent the ends of itslegs and engaging and secured to said shank only along the teeth of saidcorrugated surface.

6. In an electric heater for hair waving, a tubular heating portion, aheat insulating shank having a lateral extension carrying said portion,and a U-shaped handle having its legs secured to opposite sides of themain body of said shank, the handle and the tubular heating portionextending in parallel and opposite directions from said shank.

7. In an electric heater for hair waving, an electrical insulating shankhaving a lateral extension, a handle secured to the main body of saidshank, a tubular heating portion having an end seated in said lateralextension, a passage for lead in wires in said shank, spaced terminalsfor said lead in wires in said shank, and an electric heating wire insaid heating portion and having its ends extending from said portion andconnected to said terminals.

8. In an electric heater for hair waving, an electrical insulating shankhaving a lateral extension, a handle secured to the main body of saidshank, a tubular heating portion having an end seated in said lateralextension, a passage for lead in wires in said shank, spaced terminalsfor said lead in wires in said shank, an electric heating wire in saidheating portion and having its ends extending from said portion andconnected to said terminals and passing over said extension from saidtubular heating portion to said terminals, and a sheet of insulatingmaterial lying over one exposed line of said heating wire and extendingunder the other exposed line of said heating wire to keep the twoexposed lines from coming into contact with each other.

9. In an electric heater for hair waving, a shank having a lateralextension, a handle secured to the main body of said shank, and atubular heating portion carried by said lateral extension, said tubularheating portion comprising two substantially concentric tubes and anelectric heating wire interposed therebetween and insulated therefrom,the inner tube extending out beyond the outer tube at one end andpassing through and spread into a seat in an aperture in said extensionand the outer tube abutting against the extension.

10. In an electric heater for hair waving, a shank having a lateralextension, a handle secured to the main body of said shank, and atubular heating portion carried by said lateral extension; said tubularheating portion comprising two substantially concentrically arrangedtubes, the inner tube projecting beyond the outer tube at one end andbeing substantially in alinement and in rigid engagement therewith atthe other end, and the projecting end of the inner tube passing throughand seated in an aperture in said extension and expanded to engage theboundary surface of said aperture at one side of said extension, and theadjacent end of the outer tube abutting against the opposite side ofsaid extension, whereby the tubular heating portion is rigidly securedin and to said shank extension.

JOHN M. OI-ILENBUSCH.

